Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca484fabc1fbcf…

MALICIOUS

PDF

104.9 KB Created: 2021-02-16 10:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8bf2d2261b492dfed1b961dee4a3727 SHA-1: 51a5905489ece00157868ba430575e927bfe33a1 SHA-256: 81ca484fabc1fbcffaa20fcfefa6435d414dcda865b980dc089e3b8ebb54bddf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, with one prominently featured in the document body and heuristics pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via the linked URL. No scripts were extracted, but the PDF structure and URL analysis suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=resumen+manifiesto+comunista+marx+y+engels PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452845/normal_5fee4a3877924.pdfIn PDF document text
    • http://proflist-kursk.ru/75559985499vo9ci.pdfIn PDF document text
    • http://ulekschool.online/860762986409fe5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_5fd1719ea01ab.pdfIn PDF document text
    • http://juilopkiretlo.ru/59095984959o1c8t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389394/normal_600559f1d9f94.pdfIn PDF document text
    • http://24goodstore.site/wifarokabajonekidag5ucjr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mowobamalopun.epizy.com/retirement_resignation_letter_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/goodreads_er_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/schindler_s_list_movie_hd_popcorn.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/foreign_exchange_risk_management_techniques.pdfIn PDF document text
    • http://selewexa.rf.gd/dewugogezeraxopimu.pdfIn PDF document text
    • http://bunetexugefu.rf.gd/53456202852.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/58117704512.pdfIn PDF document text
    • http://dipokufaso.epizy.com/78324355747.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/buyers_guide_salina_ks.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/axis_camera_station_software_free.pdfIn PDF document text
    • http://nasakil.rf.gd/element_32_720p_hd_led_roku_tv_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/73247562430.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B63 5380 bytes
SHA-256: c75e43cfd681bc7bb8aea6521f43d278742671a103faf0066f270262d5a26a7e
font_01_sfnt_off00016da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA9 11876 bytes
SHA-256: 6ece8f91d027ba817c63f061562afc8071af13acb5e2cf500831995e157211d4

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